Bank charges suffocating customers   A crisis is brewing in the Nigerian banking sector over the imposition of controversial charges by banks on their customers. Complaints over these charges have reached a level that can no longer be ignored, so the monetary authorities must act immediately to address the issues involved. Anecdotal evidence from Nigerians shows that many bank customers are being discouraged by the incidences of these charges. The charges come in different categories. There are charges for electronic transactions; there is a maintenance charge, there is a stamp duty charge, and there...